#!/bin/sh
################################################################################
# test_LAN_triple-isolate__piece_of_cake.qos (Cero3 Shaper)
#
# Abstract:
# This is a one band cake and ipv6 enabled shaping script for Ethernet
# gateways. This exists for the purpose of testing cake's different isolation
# options, specifically the non-directional triple-isolate feature that promises
# to finally tackle the bit-torrent hole in simple.qos.
# This specific version is supposed to be used on LAN interfaces:
# 	the script's ingress direction equals the internet/WAN upload direction
# 	the script's egress direction equals the internet/WAN download direction
#
# NOTE: Shaping on a LAN interface only affects machines connected via that
#	LAN interface, so typically WIFI/WLAN traffic will not be shaped!
#
################################################################################
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
#  Copyright (C) 2012-2016
#    Michael D. Taht, Toke Høiland-Jørgensen, Sebastian Moeller
#
################################################################################

. ${SQM_LIB_DIR}/defaults.sh

################################################################################


# this will only work with cake as qdisc...
QDISC=cake


# to keep this as simple as possible we ignore the *_CAKE_OPTS from defaults.sh
INGRESS_CAKE_OPTS="besteffort dual-srchost"
EGRESS_CAKE_OPTS="besteffort dual-dsthost"


egress() {
    sqm_debug "egress"
    $TC qdisc del dev $IFACE root 2>/dev/null
    $TC qdisc add dev $IFACE root $( get_stab_string ) cake bandwidth ${UPLINK}kbit $( get_cake_lla_string ) ${EGRESS_CAKE_OPTS} ${EQDISC_OPTS}
}


ingress() {
    sqm_debug "ingress"
    $TC qdisc del dev $IFACE handle ffff: ingress 2>/dev/null
    $TC qdisc add dev $IFACE handle ffff: ingress
    $TC qdisc del dev $DEV root 2>/dev/null
    $TC qdisc add dev $DEV root $( get_stab_string ) cake bandwidth ${DOWNLINK}kbit $( get_cake_lla_string ) ${INGRESS_CAKE_OPTS} ${IQDISC_OPTS}

    $IP link set dev $DEV up

    # redirect all IP packets arriving in $IFACE to ifb0

    $TC filter add dev $IFACE parent ffff: protocol all prio 10 u32 \
	match u32 0 0 flowid 1:1 action mirred egress redirect dev $DEV
}

sqm_start() {

    #sm: flip upload and download bandwith so that the GUI values reflect directionality in regard to the ISP
    #sm: NOTE this is ugly and should be performed in defaults.sh or functions.sh if at all
    #sm: but for quick and dirty testing this should do
    local ORIG_UPLINK=${UPLINK}
    local ORIG_DOWNLINK=${DOWNLINK}
    UPLINK=${ORIG_DOWNLINK}
    DOWNLINK=${ORIG_UPLINK}


    [ -n "$IFACE" ] || return 1
    do_modules
    verify_qdisc $QDISC "cake" || return 1
    sqm_debug "Starting ${SCRIPT}"

    [ -z "$DEV" ] && DEV=$( get_ifb_for_if ${IFACE} )


    if [ "${UPLINK}" -ne 0 ];
    then
        egress
        sqm_debug "egress shaping activated"
    else
        sqm_debug "egress shaping deactivated"
        $TC qdisc del dev ${IFACE} root 2> /dev/null
    fi
    if [ "${DOWNLINK}" -ne 0 ];
    then
	verify_qdisc ingress "ingress" || return 1
        ingress
        sqm_debug "ingress shaping activated"
    else
        sqm_debug "ingress shaping deactivated"
        $TC qdisc del dev ${DEV} root 2> /dev/null
        $TC qdisc del dev ${IFACE} ingress 2> /dev/null
    fi
    return 0
}
